Improvement in paper-stock



MORRIS L. KEEN, OF JERSEYUITY, NEW JERSEY, ASSIGNOl-t 'lO HIMSELF AND SAMUEL A. WALSH, OF NEW YORK CITY.

Letters Patent No. 109,742, dated November 20, 18?0.

To all whom ,c't may concern:

Be it known that I, Mourns L. Kenn, of Jersey Git-y, State of New Jersey, have invented certain Improvements in Paper-Stock, from wood, straw, cane, flex, flax-tow, hemp, lienlp tow jute, jute-tow, manillwrope or ten; guuny or gunny-bagging, and any analogous materiai, of which the following is a description.

Take any of the material suitably prepared y an mechanical means in ordinary use for euttio on. (tuning the some to suitable fineness, and put the some in a close, strong boiler, one. of upright 'fo'riu preferred, fitted with a perforated false bottom inside, so that the stock under treatment canbe drained oh by means of a cock in the bottom of boiler communicating with space under the false bottom.

A discharge-valvcis also fitted to a passage through both bottoms, communicating with the interior of the boiler, so that the stock of pulp when finished can be discharged or blown out under pressure into a suitable receiver or tank forsaid purpose.

The boiler is also provided with a top screen or perforated diaphragm, fitted across the inside of the top of the boiler, allowing a stcam-space above the screen. The material ischarged into the boiler through a man-hole, either above or below the screen if above, a portion of the serecnf is removed to admit of charge. v

After thehoiicr is charged with the material to be treated, steam is admitted from a separate generator by means of pipes, either at top or bottom of boiler, and the material is' subjocted to steaming process at the high temperature of from 300 to 400 Fain-em heit, according t the .inateriei under treatment, for say thirty {30) minntes or more. The drniircoci: is then opened at the bottom and the condensed steam and intersticinl matter is drawn off, or a self-acting water-tap or valve may be attached that will allow the liberated interstieinl matter and condensed steam to pass oif freely during the entire steaming operation.

The stock is now subjected to hot water percolation at a tunpcrotnrc oi from1i500 to 400 Fahrenheit, injected above the screen into the steam-space, and washes out the acids and iozersticial matter acted on by the steam at high temperature.

After a lapse of a short time, say ten minutes, the percolation by hot water is stopped, and the material again subjected to steaming process for ten or fifteen minutes, the length oi time and temperature being regulated by nature or kind of material under treat-- ment, nftor'vi-hioh hot water percolation is again ,in-

The Schedule referred to in these Letters Patent and making part of the lame.

troduced, and the alternation of steaming and wasb ing continued till the material is reduced of its interstioial matter, ii'oin forty (40)-to sixty (,60) per cent,

according to thekind of stock under treatment, and

the condition desired to be obtained, as to quality or kind'of paper the stock is intended for. l

The stock thus'treatcd is ready for boiling in solution of alkali, caustic soda preferred, of a strength of 6. to12 Ben-nine, though wealgcr solutions will answer, according to the kind of material treated, soy for-(rho space of about one hour, which answers very well, and under steam pressure of from ten pounds to thirty pounds or upward, after which the alkali is drawn oil, quantum for quantum, and then a puff of stcam'or shower oi'iiot water is injcctcd'at the top of boiler abovetho screen; thereby forcing out the remnant of alkali reiiinining in the' stock under treatment; we then snbjectFthe stock to the steaming process, say ten (10) oriifteen (15) minutes, at a temperature of from 300 to 400 Fahrenheit, and then to percolation with hot water, alternating it according to stock under treatment, and the kind of paper the stool: is intended for.

It the stock is to be bleached, the more thoroughly it is cleased by steam and hot water, the easierit is bleached.

For ordinary uses it can be discharged without the last percolation washingnlluded to above.

I tcrmthe material at each of the st,

I propose to put it up in bales or other packages, for shipment and sale in this condition, ready-for the paper manufacturer to use.

I believe it is cleaner at every stage, takes sizing better, is easier to bleach, and is better prepared for the manufacture of either brown or white paper than any stock at present prepared by any other known process.

Coniining attention now to the brown stock resulting from the first process, it will beobserved that the shortness of the time ond'sinall number of operations allow my stock to be produced more cheaply than any before known having the same qualities. This is a distinction, and a most import'nnt one commercially, between my product and any others.

It differs, also, mechanically in the combination or aggregation of the iollowing qualities:

First, it is brown or unbleached.

Second, it is dull or void of brillinnoy.

' Third, it is soft or cottony.

Fourth, its fiber appears under magnifying. power mostly perfect and unbroken.

I claim as my invention-- ges of the I 1. The brown by the first process and having the and peculiarities herein described.

2. The gray paper-stock, as produced from the bmwn, by boiling the up in any convenient form for sale or 11842.

3 flffia bleached papal amok, as produced from the seveml qualities popenstock herein described, moxie brown,-

same in alkaline solutions, pm;

mayo: 2

by boiling the same in alkaline solutions, and treating it; with any bleaching materials.

in testimony whereof, I have hereunto oat name in presenceof two subscribing witnesseaf Witnesses: MORRIS L. KEEX'. 

